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/*
* Copyright 2008-2009 Freescale Semiconductor, Inc. All Rights Reserved.
*/
/*
* The code contained herein is licensed under the GNU General Public
* License. You may obtain a copy of the GNU General Public License
* Version 2 or later at the following locations:
*
* http://www.opensource.org/licenses/gpl-license.html
* http://www.gnu.org/copyleft/gpl.html
*/
/*!
* @file mbm.c
*
* @brief Driver for Freescale CAN Controller FlexCAN.
*
* @ingroup can
*/
#include <linux/module.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/netdevice.h>
#include <linux/if_arp.h>
#include <linux/if_ether.h>
#include <linux/platform_device.h>
#include <asm/io.h>
#include <asm/irq.h>
#include "flexcan.h"
#define flexcan_swab32(x) \
(((x) << 24) | ((x) >> 24) |\
(((x) & (__u32)0x0000ff00UL) << 8) |\
(((x) & (__u32)0x00ff0000UL) >> 8))
static inline void flexcan_memcpy(void *dst, void *src, int len)
{
int i;
unsigned int *d = (unsigned int *)dst, *s = (unsigned int *)src;
len = (len + 3) >> 2;
for (i = 0; i < len; i++, s++, d++)
*d = flexcan_swab32(*s);
}
static void flexcan_mb_bottom(struct net_device *dev, int index)
{
struct flexcan_device *flexcan = netdev_priv(dev);
struct net_device_stats *stats = &dev->stats;
struct can_hw_mb *hwmb;
struct can_frame *frame;
struct sk_buff *skb;
unsigned int tmp;
hwmb = flexcan->hwmb + index;
if (flexcan->fifo || (index >= (flexcan->maxmb - flexcan->xmit_maxmb))) {
if (hwmb->mb_cs.cs.code == CAN_MB_TX_ABORT)
hwmb->mb_cs.cs.code = CAN_MB_TX_INACTIVE;
if (hwmb->mb_cs.cs.code & CAN_MB_TX_INACTIVE) {
if (netif_queue_stopped(dev))
netif_start_queue(dev);
return;
}
}
skb = dev_alloc_skb(sizeof(struct can_frame));
if (skb) {
frame = (struct can_frame *)skb_put(skb, sizeof(*frame));
memset(frame, 0, sizeof(*frame));
if (hwmb->mb_cs.cs.ide)
frame->can_id =
(hwmb->mb_id & CAN_EFF_MASK) | CAN_EFF_FLAG;
else
frame->can_id = (hwmb->mb_id >> 18) & CAN_SFF_MASK;
if (hwmb->mb_cs.cs.rtr)
frame->can_id |= CAN_RTR_FLAG;
frame->can_dlc = hwmb->mb_cs.cs.length;
if (frame->can_dlc && frame->can_dlc)
flexcan_memcpy(frame->data, hwmb->mb_data,
frame->can_dlc);
if (flexcan->fifo
|| (index >= (flexcan->maxmb - flexcan->xmit_maxmb))) {
hwmb->mb_cs.cs.code = CAN_MB_TX_INACTIVE;
if (netif_queue_stopped(dev))
netif_start_queue(dev);
}
tmp = __raw_readl(flexcan->io_base + CAN_HW_REG_TIMER);
dev->last_rx = jiffies;
stats->rx_packets++;
stats->rx_bytes += frame->can_dlc;
skb->dev = dev;
skb->protocol = __constant_htons(ETH_P_CAN);
skb->ip_summed = CHECKSUM_UNNECESSARY;
netif_rx(skb);
} else {
tmp = hwmb->mb_cs.data;
tmp = hwmb->mb_id;
tmp = hwmb->mb_data[0];
if (flexcan->fifo
|| (index >= (flexcan->maxmb - flexcan->xmit_maxmb))) {
hwmb->mb_cs.cs.code = CAN_MB_TX_INACTIVE;
if (netif_queue_stopped(dev))
netif_start_queue(dev);
}
tmp = __raw_readl(flexcan->io_base + CAN_HW_REG_TIMER);
stats->rx_dropped++;
}
}
static void flexcan_fifo_isr(struct net_device *dev, unsigned int iflag1)
{
struct flexcan_device *flexcan = dev ? netdev_priv(dev) : NULL;
struct net_device_stats *stats = &dev->stats;
struct sk_buff *skb;
struct can_hw_mb *hwmb = flexcan->hwmb;
struct can_frame *frame;
unsigned int tmp;
if (iflag1 & __FIFO_RDY_INT) {
skb = dev_alloc_skb(sizeof(struct can_frame));
if (skb) {
frame =
(struct can_frame *)skb_put(skb, sizeof(*frame));
memset(frame, 0, sizeof(*frame));
if (hwmb->mb_cs.cs.ide)
frame->can_id =
(hwmb->mb_id & CAN_EFF_MASK) | CAN_EFF_FLAG;
else
frame->can_id =
(hwmb->mb_id >> 18) & CAN_SFF_MASK;
if (hwmb->mb_cs.cs.rtr)
frame->can_id |= CAN_RTR_FLAG;
frame->can_dlc = hwmb->mb_cs.cs.length;
if (frame->can_dlc && (frame->can_dlc <= 8))
flexcan_memcpy(frame->data, hwmb->mb_data,
frame->can_dlc);
tmp = __raw_readl(flexcan->io_base + CAN_HW_REG_TIMER);
dev->last_rx = jiffies;
stats->rx_packets++;
stats->rx_bytes += frame->can_dlc;
skb->dev = dev;
skb->protocol = __constant_htons(ETH_P_CAN);
skb->ip_summed = CHECKSUM_UNNECESSARY;
netif_rx(skb);
} else {
tmp = hwmb->mb_cs.data;
tmp = hwmb->mb_id;
tmp = hwmb->mb_data[0];
tmp = __raw_readl(flexcan->io_base + CAN_HW_REG_TIMER);
}
}
if (iflag1 & (__FIFO_OV_INT | __FIFO_WARN_INT)) {
skb = dev_alloc_skb(sizeof(struct can_frame));
if (skb) {
frame =
(struct can_frame *)skb_put(skb, sizeof(*frame));
memset(frame, 0, sizeof(*frame));
frame->can_id = CAN_ERR_FLAG | CAN_ERR_CRTL;
frame->can_dlc = CAN_ERR_DLC;
if (iflag1 & __FIFO_WARN_INT)
frame->data[1] |=
CAN_ERR_CRTL_TX_WARNING |
CAN_ERR_CRTL_RX_WARNING;
if (iflag1 & __FIFO_OV_INT)
frame->data[1] |= CAN_ERR_CRTL_RX_OVERFLOW;
skb->dev = dev;
skb->protocol = __constant_htons(ETH_P_CAN);
skb->ip_summed = CHECKSUM_UNNECESSARY;
netif_rx(skb);
}
}
}
/*!
* @brief The function call by CAN ISR to handle mb events.
*
* @param dev the pointer of network device.
*
* @return none
*/
void flexcan_mbm_isr(struct net_device *dev)
{
int i, iflag1, iflag2, maxmb;
struct flexcan_device *flexcan = dev ? netdev_priv(dev) : NULL;
if (flexcan->maxmb > 31) {
maxmb = flexcan->maxmb + 1 - 32;
iflag1 = __raw_readl(flexcan->io_base + CAN_HW_REG_IFLAG1) &
__raw_readl(flexcan->io_base + CAN_HW_REG_IMASK1);
iflag2 = __raw_readl(flexcan->io_base + CAN_HW_REG_IFLAG2) &
__raw_readl(flexcan->io_base + CAN_HW_REG_IMASK2);
iflag2 &= (1 << maxmb) - 1;
maxmb = 32;
} else {
maxmb = flexcan->maxmb + 1;
iflag1 = __raw_readl(flexcan->io_base + CAN_HW_REG_IFLAG1) &
__raw_readl(flexcan->io_base + CAN_HW_REG_IMASK1);
iflag1 &= (1 << maxmb) - 1;
iflag2 = 0;
}
__raw_writel(iflag1, flexcan->io_base + CAN_HW_REG_IFLAG1);
__raw_writel(iflag2, flexcan->io_base + CAN_HW_REG_IFLAG2);
if (flexcan->fifo) {
flexcan_fifo_isr(dev, iflag1);
iflag1 &= 0xFFFFFF00;
}
for (i = 0; iflag1 && (i < maxmb); i++) {
if (iflag1 & (1 << i)) {
iflag1 &= ~(1 << i);
flexcan_mb_bottom(dev, i);
}
}
for (i = maxmb; iflag2 && (i <= flexcan->maxmb); i++) {
if (iflag2 & (1 << (i - 32))) {
iflag2 &= ~(1 << (i - 32));
flexcan_mb_bottom(dev, i);
}
}
}
/*!
* @brief function to xmit message buffer
*
* @param flexcan the pointer of can hardware device.
* @param frame the pointer of can message frame.
*
* @return Returns 0 if xmit is success. otherwise returns non-zero.
*/
int flexcan_mbm_xmit(struct flexcan_device *flexcan, struct can_frame *frame)
{
int i = flexcan->xmit_mb;
struct can_hw_mb *hwmb = flexcan->hwmb;
do {
if (hwmb[i].mb_cs.cs.code == CAN_MB_TX_INACTIVE)
break;
if ((++i) > flexcan->maxmb) {
if (flexcan->fifo)
i = FLEXCAN_MAX_FIFO_MB;
else
i = flexcan->xmit_maxmb + 1;
}
if (i == flexcan->xmit_mb)
return -1;
} while (1);
flexcan->xmit_mb = i + 1;
if (flexcan->xmit_mb > flexcan->maxmb) {
if (flexcan->fifo)
flexcan->xmit_mb = FLEXCAN_MAX_FIFO_MB;
else
flexcan->xmit_mb = flexcan->xmit_maxmb + 1;
}
if (frame->can_id & CAN_RTR_FLAG)
hwmb[i].mb_cs.cs.rtr = 1;
else
hwmb[i].mb_cs.cs.rtr = 0;
if (frame->can_id & CAN_EFF_FLAG) {
hwmb[i].mb_cs.cs.ide = 1;
hwmb[i].mb_cs.cs.srr = 1;
hwmb[i].mb_id = frame->can_id & CAN_EFF_MASK;
} else {
hwmb[i].mb_cs.cs.ide = 0;
hwmb[i].mb_id = (frame->can_id & CAN_SFF_MASK) << 18;
}
hwmb[i].mb_cs.cs.length = frame->can_dlc;
flexcan_memcpy(hwmb[i].mb_data, frame->data, frame->can_dlc);
hwmb[i].mb_cs.cs.code = CAN_MB_TX_ONCE;
return 0;
}
/*!
* @brief function to initial message buffer
*
* @param flexcan the pointer of can hardware device.
*
* @return none
*/
void flexcan_mbm_init(struct flexcan_device *flexcan)
{
struct can_hw_mb *hwmb;
int rx_mb, i;
/* Set global mask to receive all messages */
__raw_writel(0, flexcan->io_base + CAN_HW_REG_RXGMASK);
__raw_writel(0, flexcan->io_base + CAN_HW_REG_RX14MASK);
__raw_writel(0, flexcan->io_base + CAN_HW_REG_RX15MASK);
memset(flexcan->hwmb, 0, sizeof(*hwmb) * FLEXCAN_MAX_MB);
/* Set individual mask to receive all messages */
memset(flexcan->rx_mask, 0, sizeof(unsigned int) * FLEXCAN_MAX_MB);
if (flexcan->fifo)
rx_mb = FLEXCAN_MAX_FIFO_MB;
else
rx_mb = flexcan->maxmb - flexcan->xmit_maxmb;
hwmb = flexcan->hwmb;
if (flexcan->fifo) {
unsigned long *id_table = flexcan->io_base + CAN_FIFO_BASE;
for (i = 0; i < rx_mb; i++)
id_table[i] = 0;
} else {
for (i = 0; i < rx_mb; i++) {
hwmb[i].mb_cs.cs.code = CAN_MB_RX_EMPTY;
/*
* IDE bit can not control by mask registers
* So set message buffer to receive extend
* or standard message.
*/
if (flexcan->ext_msg && flexcan->std_msg)
hwmb[i].mb_cs.cs.ide = i & 1;
else {
if (flexcan->ext_msg)
hwmb[i].mb_cs.cs.ide = 1;
}
}
}
for (; i <= flexcan->maxmb; i++)
hwmb[i].mb_cs.cs.code = CAN_MB_TX_INACTIVE;
flexcan->xmit_mb = rx_mb;
}
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